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a in (-oo:+oo)
3/5-(5*a) = -97/5 // + -97/5
3/5-(5*a)-(-97/5) = 0
3/5-5*a+97/5 = 0
20-5*a = 0 // - 20
-5*a = -20 // : -5
a = -20/(-5)
a = 4
a = 4
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